Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities - Additional Information (Detail)

v3.8.0.1
Accrued Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued liabilities $ 1,256 $ 893